* Refactoring: move initialisation and argument parsing into a shared

  file.

1 files changed, 63 insertions, 0 deletions

diff --git a/src/shared.cc b/src/shared.cc
new file mode 100644
index 000000000000..6d157766e4af
--- /dev/null
+++ b/src/shared.cc
@@ -0,0 +1,63 @@
+#include <iostream>
+
+extern "C" {
+#include <aterm2.h>
+}
+
+#include "globals.hh"
+#include "shared.hh"
+
+#include "config.h"
+
+
+/* Initialize and reorder arguments, then call the actual argument
+   processor. */
+static void initAndRun(int argc, char * * argv)
+{
+    /* Setup Nix paths. */
+    nixStore = NIX_STORE_DIR;
+    nixLogDir = NIX_LOG_DIR;
+    nixDB = (string) NIX_STATE_DIR + "/nixstate.db";
+
+    /* Put the arguments in a vector. */
+    Strings args;
+    while (argc--) args.push_back(*argv++);
+    args.erase(args.begin());
+    
+    /* Expand compound dash options (i.e., `-qlf' -> `-q -l -f'). */
+    for (Strings::iterator it = args.begin();
+         it != args.end(); )
+    {
+        string arg = *it;
+        if (arg.length() > 2 && arg[0] == '-' && arg[1] != '-') {
+            for (unsigned int i = 1; i < arg.length(); i++)
+                args.insert(it, (string) "-" + arg[i]);
+            it = args.erase(it);
+        } else it++;
+    }
+
+    run(args);
+}
+
+
+int main(int argc, char * * argv)
+{
+    /* ATerm setup. */
+    ATerm bottomOfStack;
+    ATinit(argc, argv, &bottomOfStack);
+
+    try {
+        initAndRun(argc, argv);
+    } catch (UsageError & e) {
+        cerr << format(
+            "error: %1%\n"
+            "Try `%2% --help' for more information.\n")
+            % e.what() % programId;
+        return 1;
+    } catch (exception & e) {
+        cerr << format("error: %1%\n") % e.what();
+        return 1;
+    }
+
+    return 0;
+}